High incidence of orbital malignant lymphoma in Japanee patient

Purpoe To review 244 cae of orbital tumor to determine pathologic finding in Japanee patient. Deign Obervational cae erie. Method We tudied the pathology and origin of tumor in the orbit in 244 conecutive Japanee patient with orbital tumor at our intitution from 1981 through 2002 (age 0 to 90 year, mean, 48.7 year; 114 men, 130 women). Reult The mot common tumor were lymphoproliferative dieae (n = 114, 42.5%), including malignant lymphoma (n = 59, 24.1%) and reactive lymphoid hyperplaia (n = 45, 18.4%), pleomorphic adenoma (n = 21, 8.6%), and cavernou hemangioma (n = 18, 7.4%). Concluion The incidence of lymphoproliferative dieae, epecially malignant lymphoma, wa very high in Japanee patient.